P0180 — Fuel temperature sensor A circuit malfunction

P0180: Fuel temperature sensor A circuit malfunction — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

P0180 identifies an abnormality in the monitored Fuel Temperature Sensor A circuit. It describes an electrical/signal fault, not proven fuel overheating. Depending on vehicle configuration, the sensor may be in the tank, pump module or supply circuit. P0182/P0183 are low/high-input codes and P0181 is range/performance; do not conflate them. Consult the actual engine wiring diagram before choosing parts.

Affected system: Fuel temperature sensing

Symptoms

  • MIL or stored code, sometimes without a driveability change; warning strategy varies.
  • Fuel-temperature PID unavailable, implausible or substituted where supported.
  • Possible altered running on controllers using fuel temperature in control calculations, not an obligatory symptom.

Possible causes

  • Loose/corroded connector or broken/chafed harness.
  • Short to ground or supply, faulty ground/reference depending on circuit design.
  • Failed sensor or contact within an integrated assembly.
  • Misconnection following fuel-system service.

What to check

  • 1. Identify the engine and Fuel Temperature Sensor A location from the VIN-specific diagram; do not assume tank placement.
  • 2. Save all codes, any freeze-frame and active/intermittent status; investigate shared supply faults first.
  • 3. After a long cold soak, inspect fuel-temperature PID relative to ambient conditions; an impossible value suggests a signal issue, not automatically a failed sensor.
  • 4. With ignition off and fuel lines unopened, inspect connector, insulation and harness for damage or recent work.
  • 5. Test supply, ground and signal only using OEM pinout; isolate opens/shorts before replacing the sensor.
  • 6. Where the fitted part is a thermistor and OEM procedure permits, test unplugged/unpowered resistance at known temperature against its OEM curve; never heat components near fuel.
  • 7. For an intermittent fault, watch the PID while safely moving accessible wiring; abrupt jumps suggest a contact issue rather than physical temperature.
  • 8. Repair demonstrated cause and rerun the OEM confirmation/monitor. Stop work/driving for fuel leaks or strong fuel odors.

Also written as: P0180-00, P018000, PO180 (some scan tools add the fault-type byte, e.g. -00).